Chuck



J. SCHWAHLEN.

CHUCK.

APPLICATION FILED IJEc. I, 1921.

Patented Mar. 21, 1922.

v if.

gelb h UNITED STATES JOSEF SCHWAHLEN, OF SOLINGEN, GERMANY.

CHUCK.

Specification of Letters Patent. i Patented Mal. 21, 1922.

Application filed December 1, 1921. Serial No. 519,275.

To @ZZ autom t may concern.'

Be it known that I, Josnr SoHwAHLnN, a citizen ot the German Republic, and residing at Solingen, Germany, have invented certain new and useful linproxf'em'ents in Chucks, (for which l have filed application in Germany, Nov. 29, 1920,) of which the following is a specification.

Heretofore, chucks are known for the operation of boiler stay-bolts and the like, in which a screw serves for closing the clamping-jaws, said screw being locked by means oi" a spring-pressed stirrup guided on the shaft ot the tool and engaging in ratchets of the nut belonging to said screw and in `which said clamping-jaws are located.

rlhe present invention consists in arranging on the shaft ot said screw and beneath the spring-pressed stirrup engaging in the ratchets of said nut, a turnable ring with helically inclined planes, for the purpose of lifting the stirrup from said ratchetsV by means of said inclined planes when the ring is correspondingly turned and of fixing the stirrup in the disengaged position, so that the screw can be screwed out of the nut and the chuck can be opened.

ln the accompanying drawing, the iniproi'ed chuck is represented: Fig. l is a central longitudinal section, F ig. 2 is an elevation, Fig. is an underside plan View, and Fig. .-lis a plan View, ot the saine.

rihe cornered shaft i is provided with a screw Z, on which the nut f; is screwed. At its i'ront end, the nut c is conically bored-out and there serres ior the reception oi clamping-jaws (Z, which are pressed asuiider and against the walls ot the nut c by means ot' springs e. Upon the screw b being screwed toward the clamping-jaws (Z, the latter are adjusted in the nut c to the front end of the same, whereby the clamping-jaws (Z are closed and the chuck is clamped fast on the work-piece.

ln a. slot f of the shaft a, a. stirrup g is guided. which, through recesses fr ot a collar j' of the screw Z), engages in ratchets Zi ot the nut and thereby prevents the screw Z), when turning the chuck backwards, from being` screwed out of the nut whereby the chuck would be opened and disengaged from the work-piece. In the hollow shat't a of the screw o, a spring Z0 is arranged, which acts upon the stirrup g and thereby keeps the saine in sprin Contact with the ratchets Zz, of the nut c. The screw o can thus be freely screwed in the nut o, owing to the springy arrangement of the stirrup g.

Below the stirrup g and in a depression lz' of the screw o, a turnable ring o is niounted,which-is provided with two helically inclined planes Z. Upon the ring o being so adjusted that the highest points of the planes Zv are located beneath the stirrup g, the latter is disengaged from the ratchets if, of the nut and the screw o can be screwed out of the nut c, the chuck being thus opened. In order to x the ring o in the position above-described, catches m are arranged on the underside of the stirrup g, which engage in corresponding notches a ot the ring 0 and which are held therein by the springy arrangement of the stirrup g.

llor using the chuck, a hand-lever is set upon the shaft a of the screw b and the chuck is turned by the saine in one or the other direction, according to whether the work-piece is to be tightened or loosened. To prevent the clamping-jaws Z slipping on the work-piece, their gripping surfaces are toothed.

W hat I claim, is:

ln a chuck, the combination with a nut having ratchets therein, clamping-jaws in the front en d or" said nut, a screw engaging in said nut and adapted to close said clamping-jaws, an operating shaft on said screw, and an axially guided spring-pressed stirrup engaging in the ratchets ot said nut Y and adapted to lock said clamping-jaws in closed positions, of a turnable ring having notches therein and arranged on said shaft and vbeneatl'i said spring-pressed stirrup, there being helio-ally inclined planes on said ring adapted, when the ring is correspondingly turned, to litt said stirrup and to disengage the saine from the ratchets of said nut, and catches on said stirrup adapted to engage in the notches in said ring and thereby to i'iX the latter in its stirrup-engaging position, substantially as and for the purpose set forth.

ln testimony whereof l have hereunto set my hand in the presence ot two subscribing witnesses.

JOSEF SCHVVAHLEN.

l/Vitnesses:

Max N oLDnN, TRUDF. EUKE. 

